\begin{table}[htbp]\centering
\def\sym#1{\ifmmode^{#1}\else\(^{#1}\)\fi}
\caption{Subgroup effects on child mortality by baseline mortality rate }
\begin{tabular}{lgggg}
\toprule
& (1)                       & (2)                                                          & (3)                                                             & (4)                                                                              \\
\multirow{-2}{*}{}                             & \textbf{58th}      & \textbf{\begin{tabular}[c]{@{}c@{}}66th\end{tabular}} & \textbf{\begin{tabular}[c]{@{}c@{}}75th\end{tabular}} & \textbf{\begin{tabular}[c]{@{}c@{}}90th\end{tabular}}        \\
\midrule
\multirow{2}{*}{Treat}  & -0.007           & -0.005                                                            & -0.009                                                                &    -0.012                                                                \\
& (0.011 )           & (0.011)                                                            & (0.010)                                                               &     (0.009)                                                            \\
\multirow{2}{*}{Treat * U5MR above xxth percentile}  & -0.012           & -0.017                                                            & -0.009                                                                &    0.016                                                                \\
& (0.016 )           & (0.016)                                                            & (0.017)                                                               &     (0.023)                                                            \\
\multirow{2}{*}{U5MR above xxth percentile}  & -0.028           & -0.017                                                            & -0.006                                                                &    -0.006                                                                \\
& (0.017 )           & (0.017)                                                            & (0.018)                                                               &     (0.018)                                                            \\
\multirow{2}{*}{Treat + Treat * U5MR above xxth percentile}  & -0.018           & -0.022*                                                            & -0.017                                                                &    0.003                                                                \\
& (0.011 )           & (0.012)                                                            & (0.013)                                                               &     (0.021)                                                            \\
\bottomrule
\end{tabular}
\end{table}
